php网站如何修改数据库密码

ALTER USER 'username'@'localhost' IDENTIFIED BY 'new_password';

SET PASSWORD FOR 'username'@'localhost' = PASSWORD('new_password');

$servername = "localhost";
$username = "your_username";
$password = "new_password"; // 更新为新密码
$dbname = "your_database";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}
echo "连接成功";

$servername = "localhost";
$username = "your_username";
$password = "new_password"; // 更新为新密码
$dbname = "your_database";

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    // 设置 PDO 错误模式为异常
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    echo "连接成功";
} catch(PDOException $e) {
    echo "连接失败: " . $e->getMessage();
}